SCR stands for

Electrical Engineering XYZ MCQs

SCR stands for:

  1. Single controlled rectifier
  2. Silicon controlled rectifier
  3. Surface controlled rectifier
  4. None of above

Correct answer: 2. Silicon controlled rectifier


A Silicon Controlled Rectifier (SCR) is a semiconductor device that is widely used for controlling power in various applications. It’s a type of thyristor, which is a four-layer solid-state device. The term “silicon” refers to the material used in its construction, while “controlled” indicates its ability to control the flow of current. The term “rectifier” signifies its ability to convert alternating current (AC) to direct current (DC).

Let’s break down the other options:

  1. Single controlled rectifier: This option combines “single” with “controlled rectifier,” but it’s not a standard term used in electronics. Additionally, it doesn’t specify the material or type of the device, so it’s not a commonly recognized term.
  2. Surface controlled rectifier: While this option adds “surface controlled” to “rectifier,” it doesn’t correspond to the commonly accepted terminology. There are devices like MESFETs (Metal-Semiconductor Field-Effect Transistors) that are surface-controlled, but they are not rectifiers in the typical sense.
  3. None of the above: This option simply negates the previous options but doesn’t provide any information about what SCR stands for.

In summary, the correct and commonly recognized expansion of SCR is “Silicon Controlled Rectifier,” making the second option the correct answer.

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